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• Mac下升级Python到3.5.2
  bash update

#在bash中打开
~/.bash_profile
#在zsh中打开
～/.zshrc 
然后分别在文件的最后复制以下即可(前提是根据默认设置已经好安装Python3.5)
alias python='/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5'

NSString *str = [NSString new];

let str = "hello world";